CN113777861A - Single-chip LCD projector - Google Patents
Single-chip LCD projector Download PDFInfo
- Publication number
- CN113777861A CN113777861A CN202111055392.8A CN202111055392A CN113777861A CN 113777861 A CN113777861 A CN 113777861A CN 202111055392 A CN202111055392 A CN 202111055392A CN 113777861 A CN113777861 A CN 113777861A
- Authority
- CN
- China
- Prior art keywords
- light
- reflective polarizer
- lcd panel
- polarization state
- glass substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000010287 polarization Effects 0.000 claims abstract description 76
- 230000004907 flux Effects 0.000 claims abstract description 15
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims description 61
- 239000011521 glass Substances 0.000 claims description 53
- 230000031700 light absorption Effects 0.000 claims description 19
- 238000002310 reflectometry Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002086 nanomaterial Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133502—Antiglare, refractive index matching layers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3144—Cooling systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to a single-chip LCD projector, comprising a light source; the polarizer is arranged on the light emitting side of the light source and converts the light emitted by the light source into linearly polarized illumination light; the LCD panel is arranged on the light emergent side of the polarizer and is used for modulating the linear polarized illumination light into modulated light; the polarization analyzer is arranged on the light emitting side of the LCD panel, is separated from the LCD panel and is obliquely arranged, and comprises a reflective polarizer and a functional structure, wherein the functional structure is used for enabling the ratio of the luminous flux of the first polarization state modulation light in the reflection light path to the luminous flux of the first polarization state modulation light emitted by the LCD panel to be smaller than a preset value; and a lens for projecting the second polarization state modulated light reflected by the reflective polarizer and arranged in the reflection light path of the analyzer. The scheme of the invention can effectively solve the problem that the temperature of the LCD panel is increased due to the heat absorption of the analyzer, and can effectively improve the contrast of a projection picture and solve the problem of ghost.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a single-chip LCD projector.
Background
The projector is a device which can project images or videos onto a curtain for display, and is widely applied to places such as families, offices, schools or movie theaters. Among them, the single-chip LCD projector is very popular with consumers because of its simple structure and low cost.
In general, an LCD module used in a single-chip LCD projector includes an LCD panel and a TFT-side polarizing plate and a CF-side polarizing plate attached to both sides of the LCD panel. The LCD module in the single-chip LCD projector has high light intensity, and because devices such as a TFT-side polarizing plate in the LCD module, an RGB filter film layer in the CF substrate, a bm (black matrix) film layer in the CF substrate, and a CF-side polarizing plate absorb light, light energy is converted into heat energy, so that the LCD module has high working temperature, and the high temperature may cause the liquid crystal in the LCD module to fail and lose dimming capability.
In addition, the single-chip LCD projector has a problem of low contrast of a projection screen, and even has a problem of ghost.
Disclosure of Invention
The invention provides a single-chip LCD projector aiming at the problems in the prior art.
To solve the above technical problem, an embodiment of the present invention provides a single-chip LCD projector, including:
a light source;
the polarizer is arranged on the light emitting side of the light source and is used for converting the light emitted by the light source into linearly polarized illumination light;
the LCD panel is arranged on the light emitting side of the polarizer and is used for modulating the linear polarized illumination light according to an image signal to generate modulated light, and the modulated light comprises first polarization state modulated light and second polarization state modulated light;
the analyzer is arranged on the light emitting side of the LCD panel and is separated from the LCD panel, and the analyzer and the optical axis of the modulated light emitted by the LCD panel are obliquely arranged; the analyzer comprises a reflective polarizer and a functional structure arranged on one side of the reflective polarizer, which faces away from the LCD panel, wherein the reflective polarizer is used for reflecting the second polarization state modulation light and transmitting the first polarization state modulation light, and the functional structure is used for enabling the ratio of the luminous flux of the first polarization state modulation light in a reflection light path of the reflective polarizer to the luminous flux of the first polarization state modulation light emitted by the LCD panel to be smaller than a preset value;
and the lens is arranged in a reflection light path of the analyzer and used for projecting the second polarization state modulation light reflected by the reflection type polarizer.
The invention has the beneficial effects that: the analyzer is separated from the LCD panel, so that heat generated by the analyzer is prevented from being directly transmitted to the LCD panel, and the problem of temperature rise of the LCD panel due to heat absorption of the analyzer is effectively solved; the analyzer comprises a reflective polarizer and a functional structure, the reflective polarizer reflects second polarization state modulation light for forming a projection picture to the lens, and the functional structure enables the ratio of the luminous flux of the first polarization state modulation light in a reflection light path of the reflective polarizer to the luminous flux of the first polarization state modulation light emitted by the LCD panel to be smaller than a preset value, so that the first polarization state modulation light which does not benefit the projection picture and enters the lens is reduced or eliminated, the contrast of the projection picture is improved, and the ghost problem is solved.
Further, the functional structure comprises: a glass substrate and an antireflection film; the glass substrate is attached to one side, back to the LCD panel, of the reflective polarizer, and the anti-reflection film or the light absorption film is arranged on one side, back to the reflective polarizer, of the glass substrate.
Further, the reflectivity between the functional structure and the air is smaller than a preset reflectivity delta, and the preset reflectivity delta meets the following condition: δ <1/(5 × CR), where CR is the ANSI contrast achievable by the LCD projection system.
Further, the functional structure comprises: a glass substrate and a light absorbing film; the glass substrate is attached to one side, back to the LCD panel, of the reflective polarizer, and the light absorption film is arranged on one side, back to the reflective polarizer, of the glass substrate.
Further, the light absorption film adopts light absorption paint, carbon nano tubes or a light absorption micro-nano structure.
Further, the reflective polarization component with the functional structure comprises: the LCD panel comprises a quarter-wave plate and a glass substrate, wherein the quarter-wave plate is attached to one side, back to the LCD panel, of the reflective polarizer, and the glass substrate is attached to one side, back to the reflective polarizer, of the quarter-wave plate.
Furthermore, an anti-reflection film or a light absorption film is arranged on one side of the glass substrate, which faces away from the quarter-wave plate.
The functional structure further comprises a support frame, wherein the support frame is fixed on one side of the reflective polarizer, which faces away from the LCD panel, and the support frame is fixed on the edge area of the reflective polarizer.
Furthermore, the supporting frame is a rectangular frame, and the rectangular frame is fixed to four peripheries of one side of the reflective polarizer, which faces away from the LCD panel.
Further, the value of the preset value is less than 1: 100.
Additional aspects of the invention and its advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a single-chip LCD projector according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a comparative monolithic LCD projector according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a polarization detector in embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a depolarizer in embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of a depolarizer in embodiment 3 of the present invention;
FIG. 6a is a side view of a depolarizer in embodiment 4 of the present invention;
fig. 6b is a front view of the depolarizer in embodiment 4 of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
Fig. 1 is a schematic structural diagram of a single-chip LCD projector according to embodiment 1 of the present invention. As shown in fig. 1, the single-chip LCD projector includes: including a light source 110, a polarizer 120, an LCD panel 130, an analyzer 140, and a lens 150.
The light source 110 is used for emitting illumination light, and the polarizer 120 is arranged on the light emitting side of the light source 110 and is used for converting the illumination light emitted by the light source into linearly polarized illumination light; the LCD panel 130 is disposed on the light-emitting side of the polarizer 120, and is configured to modulate the linearly polarized illumination light according to an image signal to generate modulated light, where the modulated light includes a first polarization state modulated light and a second polarization state modulated light; the analyzer 140 is disposed on the light-emitting side of the LCD panel 130 and separated from the LCD panel 130, and the analyzer 140 is disposed in an inclined manner with respect to the optical axis of the modulated light emitted from the LCD panel 130; the analyzer 140 includes a reflective polarizer 141 and a functional structure 142 disposed on a side of the reflective polarizer opposite to the LCD panel, where the reflective polarizer 141 is configured to reflect the second polarization state modulated light and transmit the first polarization state modulated light, and the functional structure 142 is configured to enable a ratio of a luminous flux of the first polarization state modulated light in a reflection light path of the reflective polarizer to a luminous flux of the first polarization state modulated light emitted from the LCD panel to be smaller than a preset value, where a value of the preset value is smaller than 1: 100; the lens 150 is disposed in the reflection light path of the analyzer, and is configured to project the second polarization state modulated light reflected by the reflective polarizer.
Specifically, the light source 110 may be an LED light source that emits white illumination light, which is natural light, to provide the light required to form a projected image for the single-chip LCD projector. The light source 110 may also be a white light source that excites fluorescence with laser light, or other light sources that can generate white light.
The polarizer 120 is disposed on the light exit side of the light source 110, and is used for converting the illumination light emitted from the light source 110 into linearly polarized illumination light. The linearly polarized illumination light may be p light or s light, and may be specifically set according to actual conditions. The polarizer 120 may include a glass substrate 121 and a polarizing plate 122, and the polarizing plate 122 is attached to a side of the glass substrate 121 facing away from the light source 110. Further, the polarizer 120 is separated from the LCD panel 130, so as to avoid heat transfer between the polarizer 120 and the LCD panel 130, and the heat generated by the polarizer 120 is not directly conducted to the LCD panel 130, thereby avoiding the influence of the heat generated by the polarizer 120 on the LCD panel 130, and reducing the risk of failure of the liquid crystal material in the LCD panel 130 due to high temperature.
The LCD panel 130 is disposed on the light-emitting side of the polarizer 120, and includes a CF substrate 131 and a TFT substrate 132, and a liquid crystal material 133 sandwiched between the TFT substrate and the CF substrate. The LCD panel 130 is configured to modulate the linearly polarized illumination light emitted from the polarizer 120 according to an image signal to generate modulated light, which includes a first polarization state modulated light and a second polarization state modulated light, wherein the second polarization state modulated light has image information and is used to form a projection picture. When the LCD panel 130 is placed, the CF substrate 131 is faced to the light source 110, and the BM film on the CF substrate 131 can prevent light from directly irradiating the scan lines, the data lines, and the like, thereby prolonging the lifetime of the LCD panel 130.
The analyzer 140 is disposed on the light-emitting side of the LCD panel 130 and separated from the LCD panel 130, and the optical axis of the modulated light emitted from the LCD panel 130 and the analyzer 140 are inclined. Preferably, the angle of inclination between the analyzer 140 and the optical axis of the modulated light exiting the LCD panel 130 is 45 °. In this embodiment, by separating the analyzer 140 from the LCD panel 130, the heat generated by the analyzer 140 is prevented from being directly conducted to the LCD panel 130, and the risk of failure of the liquid crystal material in the LCD panel 130 due to high temperature is reduced.
The analyzer 140 includes a reflective polarizer 141 and a functional structure 142 disposed on a side of the reflective polarizer 141 facing away from the LCD panel 130. The reflective polarizer 141 is used for reflecting the second polarization state modulation light and transmitting the first polarization state modulation light. The reflective polarizer 141 reflects the second polarization state modulated light used for forming the projection picture to the reflective optical path, and transmits the first polarization state modulated light not used for forming the projection picture to the transmissive optical path. The reflective Polarizer 141 may be a multilayer birefringent polarizing plate (multilayered birefringency Polarizer), a Wire Grid polarizing plate (Wire Grid Polarizer), or the like.
It should be noted that, as shown in fig. 2, if the analyzer only uses the common glass substrate 1421 as the carrier substrate of the reflective polarizer 141, as mentioned above, the reflective polarizer 141 reflects the second polarization state modulated light emitted from the LCD panel 130 and transmits the first polarization state modulated light; during projection imaging, for the first polarization state modulation light, because the refractive index of the glass substrate 1421 is greatly different from the refractive index of air, fresnel reflection caused by refractive index mismatch exists on the surface of the glass substrate 1421 in contact with space, part of the first polarization state modulation light after passing through the reflective polarizer 141 is reflected on the interface between the glass substrate 1421 and air and enters a lens, and then is projected onto a projection screen through the lens 150, so that a bright line corresponding to the first polarization state modulation light is formed on the projection screen; the second polarization state modulated light is reflected to the lens through the reflective polarizer 141 and then projected to the projection screen through the lens, so that a projection picture is formed, but a bright line formed by reflection of the first polarization state modulated light interferes with the projection picture formed by projection of the second polarization state modulated light, so that the contrast of the projection picture is reduced, and even a ghost problem is caused.
In this embodiment, a functional structure 142 is disposed on a side of the reflective polarizer 141 opposite to the LCD panel, on one hand, the functional structure 142 is used for bearing the reflective polarizer 141, and on the other hand, the functional structure 142 is used for making a ratio of a luminous flux of the first polarization state modulated light in a reflection light path of the reflective polarizer 141 to a luminous flux of the first polarization state modulated light emitted from the LCD panel 131 smaller than a preset value, so that the first polarization state modulated light entering the lens 150, which is not beneficial to the projection picture, can be reduced or eliminated, and the influence of the first polarization state modulated light on the projection picture is avoided, thereby improving the contrast of the projection picture and solving the ghost problem. Preferably, the value of the preset value is less than 1: 100. It can be understood that the smaller the value of the preset value is, the less the first polarization state modulated light entering the lens is, the more the contrast of the projection image is favorably improved, for example, the value of the preset value may be 1:1000, 1:2000 or other values, and may be specifically set according to actual situations.
Specifically, as shown in fig. 1 and 3, the analyzer 140 includes: a reflective polarizer 141, a glass substrate 1421, and an antireflection film 1422; the glass substrate 1421 is attached to a side of the reflective polarizer 141 facing away from the LCD panel 130, and the anti-reflection film 1422 is disposed on a side of the glass substrate 1421 facing away from the reflective polarizer 141; the glass substrate 1421 and the antireflection film 1422 constitute the functional structure 142.
In this embodiment, the reflective polarizer 141 is capable of reflecting s light and transmitting p light, the first polarization state modulated light is p light, and the second polarization state modulated light is s light. When the first polarization state modulation light (p light) transmitted through the reflective polarizer 141 is incident to the interface between the glass substrate 1421 and the air, the first polarization state modulation light (p light) can be directly transmitted due to the anti-reflection film 1422, and the light flux of the first polarization state modulation light (p light) entering the lens due to fresnel reflection at the interface is greatly reduced, so that the contrast of a projection picture is improved, and the problem of generating ghost images is also solved.
It is understood that the reflective polarizer 141 may also be capable of reflecting p light and transmitting p light, where the first polarization state modulated light is p light, and the second polarization state modulated light is p light, and the principle is the same as that described above, and is not described again.
The anti-reflection film 1422 may be formed on the surface of the glass substrate 1421 opposite to the reflective polarizer 141 by a coating, sputtering, or Chemical Vapor Deposition (CVD) process. The anti-reflection film 1422 may have a multi-layer structure to increase the transmittance of the glass substrate 1421 and reduce the reflectance at the interface between the glass substrate 1421 and the air. Preferably, the reflectivity between the glass substrate 1421 and the air is made smaller than a preset reflectivity δ by the anti-reflection film 1422 disposed on the side of the glass substrate 1421 opposite to the reflective polarizer 141, and the preset reflectivity δ satisfies the following condition: δ <1/(5 × CR), where CR is the ANSI contrast that can be achieved by a single-chip LCD projector. Generally, the range of ANSI contrast CR is about 100: 1 to 2000: 1.
it should be noted that the modulated light incident on the reflective polarizer 141 has a certain light cone angle, and the above-discussed criteria are true for different angles of light. In addition, the criteria discussed above are true for different wavelengths of light. Actually, the reflectance and cut-off wavelength of s light and p light differ at a certain incident angle, and this also needs to be considered when designing an antireflection film.
The lens 150 is disposed in the reflection light path of the analyzer, and is configured to project the second polarization state modulated light reflected by the reflective polarizer 141, so as to form a projection picture on a screen or a wall surface. The lens is composed of three or four glass lenses, or more lenses, and the lens material can also be optical plastic.
In the above embodiment, by separately disposing the analyzer 140 and the LCD panel 130, the heat generated by the analyzer 140 is prevented from being directly conducted to the LCD panel 130, so as to effectively solve the problem of temperature rise of the LCD panel 130 due to heat absorption of the analyzer 140; the analyzer 140 includes a reflective polarizer 141 and a functional structure 142, the reflective polarizer 141 reflects the second polarization state modulated light used for forming the projection picture to the lens 150, and the functional structure 142 makes the ratio of the luminous flux of the first polarization state modulated light in the reflective light path of the reflective polarizer 141 to the luminous flux of the first polarization state modulated light emitted from the LCD panel smaller than a preset value, so as to reduce or eliminate the first polarization state modulated light entering the lens, which is not beneficial to the projection picture, thereby improving the contrast of the projection picture and solving the ghost problem.
Example 2
Fig. 4 is a schematic structural diagram of the depolarizer 240 in embodiment 2 of the present invention. Unlike embodiment 1, the analyzer 240 in this embodiment includes: a reflective polarizer 241, a glass substrate 2421 and a light absorption film 2422; the glass substrate 2421 is attached to a side of the reflective polarizer 241 facing away from the LCD panel 130, and the light absorption film 2422 is disposed on a side of the glass substrate 2421 facing away from the reflective polarizer 241; the glass substrate 2421 and the light absorbing film 2422 form the functional structure 242.
In the above embodiment, the light absorption film 2422 is disposed on the side of the glass substrate 2421 opposite to the reflective polarizer 241, and the light absorption film 2422 is utilized to absorb the first polarization state modulation light transmitted through the reflective polarizer 241, so that the first polarization state modulation light which enters the lens and is useless for projecting a picture is effectively reduced or eliminated, the contrast of the projected picture is improved, and the ghost problem is solved. The light absorption film 2422 may be made of light absorption paint, or provided with carbon nanotubes, or designed with a light absorption micro-nano structure, and preferably, the light absorption rate of the light absorption film is greater than 98%, so that most of the first polarization state modulation light transmitted through the reflective polarizer 241 is absorbed.
Example 3
Fig. 5 is a schematic structural diagram of the depolarizer 340 in embodiment 3 of the present invention. Unlike embodiment 1, the analyzer 340 in this embodiment includes: the LCD panel comprises a reflective polarizer 341, a quarter-wave plate 3422 and a glass substrate 3421, which are sequentially stacked, wherein the quarter-wave plate 3423 is attached to one side of the reflective polarizer 341, which is opposite to the LCD panel 130, and the glass substrate 3421 is attached to one side of the quarter-wave plate 3422, which is opposite to the reflective polarizer 341; quarter wave plate 3422 and glass substrate 3421 make up functional structure 342.
The modulated light emitted from the LCD panel 130 includes a first polarization state modulated light (p light) and a second polarization state modulated light (s light), wherein the s light is reflected by the reflective polarizer 341 and enters the lens 150, the p light passes through the reflective polarizer 341 and enters the glass substrate 3421 after passing through the quarter-wave plate 3422, most of the light passes through the glass substrate 3421 and directly enters the outside, and a small part of the light is reflected by the interface between the glass substrate 3421 and the air and then passes through the quarter-wave plate 3422 again, and at this time, the polarization state of the small part of the light is rotated by 90 degrees and converted into the p light, so that the p light is reflected by the reflective polarizer 341; the polarization state of the p light reflected back to the reflective polarizer 341 through the interface between the glass substrate 3421 and the air returns to the original polarization state capable of being transmitted by the reflective polarizer 341, but considering that the interface reflectivity is generally 4%, the ratio after two reflections is less than two thousandths of the first polarization state modulated light (p light) originally incident to the reflective polarizer 341. In the above embodiment, the quarter-wave plate 3422 is disposed between the reflective polarizer 341 and the glass substrate 3421, so that the first polarization state modulated light which enters the lens and is useless for projecting the image is effectively reduced or eliminated, the contrast of the projected image is improved, and the ghost problem is solved.
In addition to the above embodiment 3, an antireflection film or a light absorption film may be further provided on the side of the glass substrate 3421 facing away from the reflective polarizer 341. Namely, the analyzer includes: a reflective polarizer 341, a quarter wave plate 3422, a glass substrate 3421, and an anti-reflection film laminated in this order; in this embodiment, by combining the quarter-wave plate 3422 with the anti-reflection film, the requirement for the reflectivity of the anti-reflection film can be effectively reduced, and the first polarization state modulated light which enters the lens and is useless for the projection screen can be further reduced or eliminated, so that the contrast of the projection screen is improved, and the ghost problem is solved.
Alternatively, the analyzer comprises: a reflective polarizer 341, a quarter wave plate 3422, a glass substrate 3421 and a light absorbing film laminated in this order; in this embodiment, the quarter-wave plate 3422 is combined with the light absorbing film, so that the requirement for the light absorption rate of the light absorbing film can be effectively reduced, and the first polarization state modulated light which enters the lens and is useless for the projection picture can be further reduced or eliminated, thereby improving the contrast of the projection picture and solving the ghost problem.
Example 4
Fig. 6a is a side view of an attenuator 440 according to embodiment 4 of the present invention, and fig. 6b is a front view of the attenuator 440 according to embodiment 4 of the present invention. Unlike embodiment 1, the analyzer 440 in this embodiment includes: a reflective polarizer 441 and a supporting frame 442, wherein the supporting frame 442 is fixed to a side of the reflective polarizer 441 facing away from the LCD panel 130, and the supporting frame 442 is fixed to an edge region of the reflective polarizer 441 to avoid an Active Area (Active Area) of the reflective polarizer 441 in the edge region, so that the Active Area of the reflective polarizer 441 is in a floating state; the support frame 442 is a functional structure in this embodiment. The effective area of the reflective polarizer 441 is greater than or equal to the maximum area of the reflective polarizer 441 onto which the modulated light emitted from the LCD panel is projected. In this embodiment, the supporting frame 442 may be a rectangular frame formed by sequentially connecting four side frames end to end, and the rectangular frame is fixed to four peripheries of a side of the reflective polarizer 441 facing away from the LCD panel 130.
In the above embodiment, the supporting frame 442 fixes the reflective polarizer 441, so that the active area of the reflective polarizer 441 is suspended, thereby avoiding the use of a glass substrate on the back of the active area of the reflective polarizer 441. Since the reflective polarizer 441 is generally thin, and the effect of the interface reflection between the reflective polarizer 441 and the air is greatly reduced without an additional glass substrate with mismatched refractive index; and then can effectively reduce the modulation light of the first polarization state which enters the lens and is useless for projecting pictures, thereby improving the contrast ratio of the projecting pictures and solving the ghost problem.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A single-chip LCD projector, comprising:
a light source;
the polarizer is arranged on the light emitting side of the light source and is used for converting the light emitted by the light source into linearly polarized illumination light;
the LCD panel is arranged on the light emitting side of the polarizer and is used for modulating the linear polarized illumination light according to an image signal to generate modulated light, and the modulated light comprises first polarization state modulated light and second polarization state modulated light;
the analyzer is arranged on the light emitting side of the LCD panel and is separated from the LCD panel, and the analyzer and the optical axis of the modulated light emitted by the LCD panel are obliquely arranged; the analyzer comprises a reflective polarizer and a functional structure arranged on one side of the reflective polarizer, which faces away from the LCD panel, wherein the reflective polarizer is used for reflecting the second polarization state modulation light and transmitting the first polarization state modulation light, and the functional structure is used for enabling the ratio of the luminous flux of the first polarization state modulation light in a reflection light path of the reflective polarizer to the luminous flux of the first polarization state modulation light emitted by the LCD panel to be smaller than a preset value;
and the lens is arranged in a reflection light path of the analyzer and used for projecting the second polarization state modulation light reflected by the reflection type polarizer.
2. The monolithic LCD projector as recited in claim 1, wherein the functional structure comprises: a glass substrate and an antireflection film; the glass substrate is attached to one side, back to the LCD panel, of the reflective polarizer, and the anti-reflection film is arranged on one side, back to the reflective polarizer, of the glass substrate.
3. The monolithic LCD projector as recited in claim 2, wherein the reflectivity between the functional structure and air is less than a predetermined reflectivity δ, wherein the predetermined reflectivity δ satisfies the following condition: δ <1/(5 × CR), where CR is the ANSI contrast that the single-chip LCD projector can achieve.
4. The monolithic LCD projector as recited in claim 1, wherein the functional structure comprises: a glass substrate and a light absorbing film; the glass substrate is attached to one side, back to the LCD panel, of the reflective polarizer, and the light absorption film is arranged on one side, back to the reflective polarizer, of the glass substrate.
5. The single-chip LCD projector as claimed in claim 4, wherein the light-absorbing film is made of light-absorbing paint, carbon nanotubes or light-absorbing micro-nano structures.
6. The monolithic LCD projector as recited in claim 1, wherein the functional structure comprises: the LCD panel comprises a quarter-wave plate and a glass substrate, wherein the quarter-wave plate is attached to one side, back to the LCD panel, of the reflective polarizer, and the glass substrate is attached to one side, back to the reflective polarizer, of the quarter-wave plate.
7. The monolithic LCD projector as recited in claim 6, wherein a side of the glass substrate facing away from the quarter-wave plate is provided with an anti-reflection film or a light absorption film.
8. The single-chip LCD projector as claimed in claim 1, wherein the functional structure comprises a support frame fixed to a side of the reflective polarizer facing away from the LCD panel, and the support frame is fixed to an edge region of the reflective polarizer.
9. The single-chip LCD projector as claimed in claim 8, wherein the supporting frame is a rectangular frame fixed to four peripheries of a side of the reflective polarizer facing away from the LCD panel.
10. The single-chip LCD projector according to any one of claims 1 to 9, wherein the predetermined value is less than 1: 100.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055392.8A CN113777861B (en) | 2021-09-09 | 2021-09-09 | Single-chip LCD projector |
| US17/939,298 US20230075173A1 (en) | 2021-09-09 | 2022-09-07 | Monolithic lcd projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055392.8A CN113777861B (en) | 2021-09-09 | 2021-09-09 | Single-chip LCD projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113777861A true CN113777861A (en) | 2021-12-10 |
| CN113777861B CN113777861B (en) | 2023-06-02 |
Family
ID=78841995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111055392.8A Active CN113777861B (en) | 2021-09-09 | 2021-09-09 | Single-chip LCD projector |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20230075173A1 (en) |
| CN (1) | CN113777861B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5844637A (en) * | 1996-03-05 | 1998-12-01 | Sony Corporation | Projection apparatus with a polarizer, glass panel, and quarter-waveplate at light exit side of liquid crystal |
| JPH11295660A (en) * | 1998-04-14 | 1999-10-29 | Matsushita Electric Ind Co Ltd | Projection picture display |
| JP2002131541A (en) * | 2000-10-24 | 2002-05-09 | Mitsubishi Electric Corp | Polarizing plate and liquid crystal projector using the same |
| CN1360218A (en) * | 2000-12-18 | 2002-07-24 | 精工爱普生株式会社 | Projection type display device |
| JP2007233410A (en) * | 2000-01-28 | 2007-09-13 | Seiko Epson Corp | Light reflective polarizer and projector using the same |
| JP2008065137A (en) * | 2006-09-08 | 2008-03-21 | Ｎｅｃディスプレイソリューションズ株式会社 | Liquid crystal projector and image display control method |
| JP2008170583A (en) * | 2007-01-10 | 2008-07-24 | Sony Corp | Liquid crystal display and projection liquid crystal display |
-
2021
- 2021-09-09 CN CN202111055392.8A patent/CN113777861B/en active Active
-
2022
- 2022-09-07 US US17/939,298 patent/US20230075173A1/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5844637A (en) * | 1996-03-05 | 1998-12-01 | Sony Corporation | Projection apparatus with a polarizer, glass panel, and quarter-waveplate at light exit side of liquid crystal |
| JPH11295660A (en) * | 1998-04-14 | 1999-10-29 | Matsushita Electric Ind Co Ltd | Projection picture display |
| JP2007233410A (en) * | 2000-01-28 | 2007-09-13 | Seiko Epson Corp | Light reflective polarizer and projector using the same |
| JP2002131541A (en) * | 2000-10-24 | 2002-05-09 | Mitsubishi Electric Corp | Polarizing plate and liquid crystal projector using the same |
| CN1360218A (en) * | 2000-12-18 | 2002-07-24 | 精工爱普生株式会社 | Projection type display device |
| JP2008065137A (en) * | 2006-09-08 | 2008-03-21 | Ｎｅｃディスプレイソリューションズ株式会社 | Liquid crystal projector and image display control method |
| JP2008170583A (en) * | 2007-01-10 | 2008-07-24 | Sony Corp | Liquid crystal display and projection liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113777861B (en) | 2023-06-02 |
| US20230075173A1 (en) | 2023-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7839574B2 (en) | Head-up display optical film, head-up display, and vehicle | |
| US9341883B2 (en) | Display module and light guide device | |
| US20050190445A1 (en) | Wire grid polarizer | |
| US8035775B2 (en) | Polarization control system and display device | |
| EP1585344B1 (en) | Projection-type display device | |
| JP2002328430A (en) | Image display device | |
| US6481850B1 (en) | Projector | |
| CN104251464A (en) | Display module and light guiding device | |
| JP3080693B2 (en) | Polarizing beam splitter array | |
| JP2830534B2 (en) | Polarization conversion element | |
| CN109960102B (en) | Projection screen | |
| JP2002131750A (en) | Projection type display device | |
| US11619823B2 (en) | Optical system for displaying magnified virtual image | |
| US20050231654A1 (en) | Projection device having an increased efficiency | |
| CN113777861B (en) | Single-chip LCD projector | |
| JP2000356770A (en) | Liquid crystal projector | |
| JP3049752B2 (en) | Projection display device | |
| US7969516B2 (en) | Projector | |
| JPH11295660A (en) | Projection picture display | |
| US20110037923A1 (en) | Light condensing film, backlight module and liquid crystal display | |
| CN217333099U (en) | Promote projecting apparatus of monolithic LCD screen performance | |
| CN215867486U (en) | Single-chip LCD projector | |
| WO2019168653A1 (en) | High-contrast polarizer | |
| JP3508275B2 (en) | LCD projector | |
| CN218763000U (en) | Light scattering assembly and LED display screen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |